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Description
Bafang H640 750W Geared Hub Motor — Cassette FreehubBrand new, OEM Bafang H640 (RM G0900. 750. D DC) geared rear hub motor the proven workhorse engineered for eMTB, eSpeed, and high performance e bike conversions. Cassette freehub design (711 speed compatible), 80Nm of torque, and 1: 5 planetary gear reduction for strong acceleration and reliable hill climbing performance. Rated 750W Up to 2000W peak with the HPC controller Hi Power Cycles stocks the H640 for builders who want a clean, quiet, low
Brand new, OEM Bafang H640 (RM G0900.750.D/DC) geared rear hub motor — the proven workhorse engineered for eMTB, eSpeed, and high-performance e-bike conversions. Cassette freehub design (7–11 speed compatible), 80Nm of torque, and 1:5 planetary gear reduction for strong acceleration and reliable hill-climbing performance.
Hi-Power Cycles stocks the H640 for builders who want a clean, quiet, low-maintenance hub motor without the drivetrain wear of a mid-drive. Paired with the matched HPC controller, the H640 unlocks up to 2000W of peak output — far beyond what stock Bafang controllers deliver — making it one of the most powerful geared hubs on the market.
Why the Bafang H640?
- 750W continuous power, up to 2000W peak when paired with the HPC high-output controller
- 80Nm of torque — strong enough for loaded cargo bikes, fat-tire builds, and steep climbs
- Cassette freehub (not freewheel) — accepts 7-, 8-, 9-, 10-, and 11-speed cassettes for modern drivetrain compatibility
- IP-rated waterproof construction — built to handle rain, dust, and trail conditions
- Quiet, smooth planetary gear reduction — far less noticeable than direct-drive hubs at low speed
- Genuine OEM Bafang sourced through authorized supply chain
Specifications
| Model | Bafang H640 / RM G0900.750.D/DC |
| Rated Power | 750W (48V) |
| Peak Power (HPC Controller) | Up to 2000W |
| Max Torque | 80 Nm |
| Voltage | 48V nominal (52V compatible) |
| Max Speed | 28–32 mph (depending on wheel size & controller) |
| Weight | ~5.6 kg (12.3 lbs) |
| Dropout (OLD) | 135–142 mm rear |
| Freehub Type | Cassette (7–11 speed compatible) |
| Brake Compatibility | Disc brake only |
| Spoke Pattern | 36H × 13G |
| Wheel Sizes | 26", 27.5", 700C |
| Waterproof Rating | IPX5 |
| Gear Reduction | 1:5 planetary (15T/30T/75T) |
| Pole Pairs | 10 (20 magnets) |
What's in the Box
- (1) Bafang H640 hub motor (bare hub, no wheel build)
- Motor cable with G11.6 connector
Build Notes & Compatibility
The H640 is a bare hub motor — it does not include a rim, spokes, controller, display, or battery. We can lace this hub into a custom hand-built wheel — contact us for a complete wheel build quote.
For maximum performance, pair the H640 with:
- A 48V or 52V lithium battery rated for high continuous discharge (the HPC controller can pull serious current at 2000W peak)
- The HPC high-output controller — unlocks the full 2000W peak output from the H640. Stock Bafang controllers will limit you to roughly half that.
- A Bafang-compatible display (DP C181, DP C18, C961) or aftermarket eBike display
Why Buy from Hi-Power Cycles?
HPC has been building and selling high-performance electric bikes since 2008, with 20,000+ customer builds, US Special Forces and Army Corps of Engineers as verified clients, and a GSA Schedule contract (#47QSMS24D005F) for federal and military sales. Every component we sell is sourced through authorized channels and backed by real US-based technical support out of Simi Valley, California.
Questions about fitment, wheel building, or pairing the H640 with our 2000W controller?
Email [email protected] or call (818) 734-1600
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy